Perpendicularity-indicator



H. JANTSCH AND w. E. GULDAGER.

PERPENDICULARITY INDICATOR.

APPLICATION FILED MAR. I, 1919.

1,345,597, I at ntedifuly fi,192..

HTTDJTA/EY.

HUGO JAN'TSGHAND WALTER E. GrULDAG'rER, DETROIT, MICHIGAN.

PEEPENDICULARITY-INDIOAT R.

igsiase'r.

Specification of Letters Patent.

Patented July ti, ltlfid.

n pplicatioufiled March 1, 1919. Serial No. erases;

To all whom it may concern." Be it known that we, HUGO JAN'rsoi-r, acitizen of Bohemia, and VVALTER E. Gunn- AGER, a subject ofthe King ofDenmark, residing at Detroit, county of Wayne; State J of Michigan, haveinvented a new and use i'ul Improvement in Perpendicularity-Tndicators,of which the following is a specification.

This invention relates to an instrument for indicating variations from atruecon dition of perpendicularity. Inaccurate machine work heretoforeit has been customary to use a try-square to determlne whether a g ven pece of'work was perpendicular to the surface on which the try-square isrested.

Ithas been usual to place the piece of work or other object on a levelsurface, then move the try-square up fagainst the object and testforperpendicularity by drawing strips of paper between the try-square,and the Nohject. By noting; whether they draw through easily or withdifficulty, the operator is able to estimate the proximity of thesurface of the object to a perpendicular condition, Obviously theoperator cannot tell the amount of variation within precise lim" itsanditis also a rather difficult joluusually requiring two men toperiorin this, one man tohold the try-square and the other to draw thepaper between the upright arm of the try-square and the object.

TlijiS the object of the present invention to provldean instrument foraccomphsh ng this purpose which will accurately indicate any variationfrom perpendicularity and which can beeasily manipulated by oneoperator.

which it rests.

Igure 118 a SIClG elevation ishowingthe nstrument in pos tion to measurethe perpendicularity of an ob ect to a suri'ace upon Fig. 2 is a rearelevation of the trysquare equipped with the indicator carrier. Fig. 3is a section taken on the line 3-43 of Fig.1. t

Fig. 4c is an inside elevation of the indicator carrier; in factyaviewof the carrier 50 4 from. a position underneathFig.

Fig. 51s a sect on on the hue 5&5 oi

il pc try-square 1s shown in elevation in Fig.

1 andfcomprises theusual thick arm a and the thin arnib. [cisanindicator well ltnown in machine workior ndicating accuratelyvariations of thousandths of an inch or less. It comprises a case inwhich is set the mechanism, which needs no description, as thesearticles are old and can be bought upon the market. (Z is aspringprojected stem or plunger which is connected with the interiormechanism so that any movement inward of the stem is accuratelyregistered by the pointer e, which swings over the graduations 7 thathappen here to he in the form of a segment attached to the outside ofthe case. it designates a spindle which supports the indicator.

The carrier comprises a slotted plate 9 provided at one edge with athickened portion to act as a seat '5 and a support The latter isslotted to receive the turned-over end of" the triangularlike flatspring in. This turned-over edge can be dowel pinned in the support j.The plate and its thickened portion is a die casting, preferably. Thespring; is a stampingwith an opening Z near the apex and a lug we turnedhack to duced portion at its juncture with the body of theslide 9 formabutments, each of which is provided with two balls. The halls in one oithese abutments are set into recesses and then a slight bit of the edgeof the recess upset or swaged in on the balls so as to re' tain them.The halls in the other abutment,

here shown as the abutment of the slide,are

set in perforations of greater diameteron the outside than the ball but.of less diameteron the inside of the ball, so that the balls 3 maybe'let in from the back of the slideand held in place by the two springarms of the flat spring t (Figs. 2 and 4t). This performs a very usefulfunction in this connection, as will be explained later. The

seats 2' and r are also provided with balls in which are set in littlesockets and then the edges of the socket swagedover the ball; The holtit passes through the slide and through the rectangular portion 79. Athumb nutn runs on the other end of the bolt.

By loosening the nut c the slide may he slid along the slot 0 so thatthe carrier may be placed over the thin arm 6 of the trysquare. Byreason of the two seats and 1' provided with balls w, the ball retainedby the spring is andthe ball-set abutments, each surface of the carrierin contact with the arm of the try-square, is provided withantifrictionbearings. Hence the slide may be clamped up tight againstthe edges of the try-square arm, so there will not be the slightest rockof the carrier in sliding along the try-squarearm edges, and by reasonof the ball bearings the indicator carrier will slide easily along thearm.

7 Hence all that is necessary is to insert the spindle hin the longopening m in the bottom of the die-cast plate 9 and secure it in anydesired position ofprojection by the application of the set screw y.

By reason of the adpistable slide the carrier isfapp'llcable totry-squares oi: various widths of arms.

When a testis to be made of an object, all that it is necessary to do isto make sure I that the try-square is held non-movably in place with'theedge of the thin leg facing the surface to he-tested; The point of thestem cl can'be' moved upragainst the surface and then the "carrierreciprocated up or down the arm '6 of the try-square and the pointer'watched to see Whether there is any indications in perpendicularity,having. in combination, a try square, an indicator carrier provided withanti-friction members so as to be freely slidable longitudinally on oneof the transverse arms of the trysquare, the said indicator carrierbeingprovided with an adjustable slide having anti-friction members andarranged so that the carrier may closely butslidably engage fourdifferent surfaces of the arm to secure the same in substantiallynon-rockablerelation to the arm: in sliding, and an indicator providedwith a stem which responds to variationsin the surface being tested andwhich reciprocates in apath that has a nearright angular relation'to'the-path of travel of the carrier.

2. An instrument for measuring variations. in perpendicularity, havingin combination, a try-square, a carrier provided withanti-frictionmembers] so as tobe freely slid- 'ablewonone of the arms ofthe try square, 'said" carrier being provided with transverse"slidehaving; anti-friction members andarranged to' cause the carrier toengage four surfaces of the said arm to avoid rocking movement insliding, and an indicator supported on the carrier and provided with aspring-projected stem functioning in a line approaching theperpendicular with re spect to the line of travel of the carrier on thearm.

8. An instrument for measuring variations in perpendicularity, having incombination, a try-square and a carrier comprising a plate for fittingone side and one edge of one of the arms of the try-square, 1n ans forengaging the other side of such arm to hold the plate to the arm, and aslide adjustable along the plate and against the other edge of such arm.

4-. An instrument for measuring ariations in perpendicularity, having incombination, a try-square and an indicator carrier slidable on one ofthe arms of the try-square and comprising a plate adapted to abutagainst one side and one edge of the arm, a spring carried by the platebearing on the other side of the, arm and a slide adjustable along theplate and bearing against the other edge of the arm.

5. An instrument for measuring variations in perpendicularity, having incombination, a try-square and an-indicator carrier slidable on one ofthe arms and comprising a plate having an e'nlargement at one endforming an abutment, the enlargement of the plate adapted to bearagainst the side of the try-square arm and one edge of the arm, a slideadjustable along the plate ad apted-to bear on one'side of the arm andthe other edge of the arm, and a spring carried by one oi. the membersadapted to bear against the other side of the try-square arm.

6. An instrument for measuring variations in perpendicularity, having incombination, a try-square and an indicator carrier slidable on one oi?the arms and comprising a plate provided with a thickened portionforming an abutment to bear against one edge of the arm and a seat tobear against one side of the arm, a slide slidable along the plate andprovided with an abutment adapted to bear against the other edge of thearm and a seat adapted to bear against the side of the arm, and a springcarried by one of the members adapted to bear against the opposite sideof the arm.

7. An instrument for measuring variations in perpendicularity, having incombination, a try-square and an indicator carrier slidable on one ofthe armsof the try-square and comprisinga plate provided at one end withan abutment having balls set therein, means for engaging. one side ofsuch arm to hold the plate thereto, and a slide provided with anabutment with balls settherein, the

said slide being adjustable along the plate so that the two abutmentsengage the opposite edges of the arm ofthe try-square.

eat er t 55. An instrument for measuring variations in perpendicularity,having in combia nation, a try-square and an indicator carrier slidableon the try-square and comprising a plate provided With an abutmenthaving balls set therein, means for engaging the side oi: the try-squareto hold the plate thereto, a slide adjustable along the plate providedwith an abutment having balls set therein, the balls in one of theabutments being provided with yieldable sockets.

9. An instrument for measuring variations in perpelulicularity, havingin combination, a try-square and an indicator carrier slidable on one oithe arms of the try-square and comprising a plate provided with anabutment having balls seated therein, means for engaging the side of thearm to holdthe plate thereto, a slide adjustable along-the plate andprovided with an abutment having balls set therein, and a flat springhaving arms yieldingly pressing the balls of one of the abutmentsoutward, the said two abutments adapted to engage two opposite edges ofthe arm of the try-square.

jUJ. An instrument for measuring varia tiens in per-pendicularity,having in combination, a try-square and an indicator carrier slidabie onone oi the arms of the try-square and comprising a plate having aball-set seat for one side of the try-square arm and a ball-set abutmentto engage one of the- HUGO JANTSCH. YVALTER E. GULDAGER.

